The man who murdered a teen by stabbing him in the neck has been sentenced to life in prison.

Hiakita (George) Eruera was sentenced to life in prison with a minimum non-parole period of 17 years at the Tauranga High Court today for the murder of Takena Tiepa-Ranapia in 2014.

A jury found Eruera guilty of Mr Tiepa-Ranapia's murder in November after a three-week trial.

Eruera stabbed the 19-year-old in the neck on November 30, 2014 at a party in Mansfield St, Ohauiti.

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He had believed Mr Tiepa-Ranapia was involved in assaulting his step-daughter earlier that night at the party.

Eruera's co-accused, his wife Hyacin Eruera and their associate Paul Taki, were found not guilty of Mr Tiepa-Ranapia's murder or manslaughter.

All three accused were found guilty of of wounding with intent to cause grievous bodily harm, a charge relating to the stabbing of Brooklyn Ormsby-Ratahi earlier on the night Mr Tiepa-Ranapia was killed.

Hyacin Eruera was sentenced to 11 months home detention and Taki received 10 months home detention.